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Rockwell Automation Publication 1606-RM028A-EN-P - September 2021
External Input Protection
The unit is tested and approved for branch circuits up to 30 A (US) and 32 A
(IEC). An external protection is required only if the supplying branch has an
ampacity greater than the approved circuit amperage. Check local codes and
local requirements. In some countries, local regulations might apply.
If an external fuse is used, minimum requirements must be considered to
avoid nuisance tripping of the circuit breaker. A minimum value of 16 A B- or
C-characteristic breaker must be used, when the unit is used at AC 100V and
AC 120V mains voltages (including AC 230V). If the unit is used only at AC 230V
mains, a 10 A B- or C-characteristic breaker is sufficient.
Parallel Use to Increase
Output Power
Power supply units from the same series can be paralleled to increase the
output power. The output voltage must be adjusted to the same value
(±100 mV) in Single Use mode with the same load conditions on all units, or
the units can be left with the factory settings. After the adjustments, move the
jumper on the front of the unit from Single Use to Parallel Use to achieve load
sharing. The Parallel Use mode regulates the output voltage so that the voltage
at no load is approximately 4% higher than at nominal load. See
. If no jumper is plugged in, the unit is in Single Use mode. The factory
setting is also Single Use mode.
If more than three units are connected in parallel, a fuse or circuit breaker with
a rating of 30 A or 32 A is required on each output. Alternatively, use a diode or
redundancy module.
Energize all units simultaneously to avoid the overload Hiccup
PLUS
mode. If
the output was in Hiccup
PLUS
mode due to overload or short circuits and the
required output current is higher than the current of one unit, turn off the
power for at least 5 seconds.
Keep a left and right installation clearance of 15 mm (0.59 in.) between the two
power supply units and avoid installing the units on top of each other. Do not
use power supply units in parallel in mounting orientations other than in the
standard mounting orientation (terminals on the bottom of the unit). Do not
use the power supply units in parallel in any other condition where a derating
of the output current is required, such as in altitudes above 60 °C (140 °F).
Understand that leakage current, EMI, inrush current, and harmonics
increase when using multiple power supply units.
Figure 43 - Parallel Use to Increase Output Power
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
